Mindful Walking in Low Back Pain

Inclusion Criteria: * male and female, 18-65 years * chronic low back pain (disease duration \> 3 months) * pain intensity on visual analogue scale at inclusion \> 40 mm (0-100 mm scale) * only pharmacological treatment with NSAID or no treatment in the last 4 weeks * undersigned informed consent form Exclusion Criteria: * active walking or jogging in the last 6 weeks (\< 60 minutes/week) * regular meditation, relaxation exercise, mindfulness exercise in last 6 weeks (\> 30 minutes per week) * use of complementary medicine therapies as acupuncture, homeopathy, herbal medicine in last 6 weeks or planned in the next 12 weeks * use of other nonpharmacological therapies as physical therapy, manual therapy or osteopathy in the last 4 weeks * participation in another trials within the last 3 months * pathological neurological symptoms such as muscular paralysis or paraesthesia due to spinal disc herniation or other causes * risk of falls and inability to walk * angina pectoris in the last 3 months * chronic respiratory disease with respiratory insufficiency * intake of central nervous system-acting analgesics in the last 6 weeks * Known renal and / or hepatic diseases * Severe organic, psychological or psychiatric disorders that are not permitting a study participation * applying for early retirement due to low back pain * no undersigned informed consent form